On Monday, Christie Brinkley and her two daughters, Alexa Ray Joel and Sailor BrinkleyCook, proved that the supermodel genes run strong in this family, posing for Sports Illustrated’s forthcoming swimsuit edition. But just because they’ve inherited their mom’s iconic bone structure doesn’t mean these young ladies have always felt confident enough to pose in a two-piece for a major magazine. After the initial image of them with their supermodel mom was released, both Joel and Cook...